<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>学生信息管理</title>
  <link rel="stylesheet" href="css/index.css" />
</head>

<body>
  <h1>新增学员</h1>
  <form class="info" autocomplete="off">
    姓名：<input type="text" class="uname" name="uname" />
    年龄：<input type="text" class="age" name="age" />
    性别:
    <select name="gender" class="gender">
      <option value="男">男</option>
      <option value="女">女</option>
    </select>
    薪资：<input type="text" class="salary" name="salary" />
    就业城市：<select name="city" class="city">
      <option value="北京">北京</option>
      <option value="上海">上海</option>
      <option value="广州">广州</option>
      <option value="深圳">深圳</option>
      <option value="曹县">曹县</option>
    </select>
    <button class="add">录入</button>
  </form>

  <h1>就业榜</h1>
  <table>
    <thead>
      <tr>
        <th>学号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>性别</th>
        <th>薪资</th>
        <th>就业城市</th>
        <th>操作</th>
      </tr>
    </thead>
    <tbody>
      <!-- 
        <tr>
          <td>1001</td>
          <td>欧阳霸天</td>
          <td>19</td>
          <td>男</td>
          <td>15000</td>
          <td>上海</td>
          <td>
            <a href="javascript:">删除</a>
          </td>
        </tr> 
        -->
    </tbody>
  </table>
  <script>
    const uname = document.querySelector('.uname').value//姓名
    const age = document.querySelector('.age').value//年龄
    const gender = document.querySelector('.gender').value//性别
    const salary = document.querySelector('.salary').value//薪资
    const city = document.querySelector('.city').value//就业城市

    const add = document.querySelector('.add')
    const tbody = document.querySelector('tbody')
    const items = document.querySelectorAll('[name]')

    add.addEventListener('click', function (e) {
      //阻止默认行为
      e.preventDefault()

      //id
      let id = 0
      const trs = document.querySelectorAll('tbody>tr')
      if (trs.length > 0) {
        id = parseInt(trs[trs.length - 1].children[0].innerHTML) + 1
      } else {
        id = 1
      }

      //创建节点
      const tr = document.createElement('tr')
      tr.innerHTML = `
            <td>${id}</td>
            <td>${uname}</td>
            <td>${age}</td>
            <td>${gender}</td>
            <td>${salary}</td>
            <td>${city}</td>
            <td>
              <a href="javascript:">删除</a>
            </td>
    `
      //追加节点
      tbody.appendChild(tr)
    })

    //删除
    tbody.addEventListener('click', function (e) {
      if (e.target.tagName === 'A') {
        e.target.parentNode.parentNode.remove()
      }
    })
  </script>

</body>

</html>